Lindsay LohanJustin Bieber Will Pay!

3/14/2013 5:30 PM PDT

Lindsay Lohan -- Justin Bieber Will Pay!

EXCLUSIVE

Justin Bieber is a naive little loudmouth who will pay for his meanness ... so vows Lindsay Lohan.

Sources close to Lindsay tell TMZ, she was "appalled" when she read what Bieber had written about her in his Instagram diatribe ... in which he said, "... to those comparing me to Lindsay Lohan look at her 2012 tax statements ;)".

Bieber quickly deleted the insult and apologized, but Lindsay is telling friends ... it's too little, too late ... and "karma" will bite him in the ass.

We're told Lindsay feels Bieber's comments were "senseless and mean" -- she's never had beef with him ... and has no idea why he chose to single her out, bullying her on an international platform.

ABOUT TMZ

CONTACT TMZ

Telepictures and Warner Bros. Entertainment Inc.
may use my email address along with my interests and device data to send me tailored email and other offers
through social media or other sites and apps.

Yes! Telepictures and Warner Bros. Entertainment Inc. may also share those details
with WB/Time Warner
Affiliates so they may send me tailored email and other offers.
Telepictures and Warner Bros. Entertainment Inc. are requesting this consent on behalf of their affiliates,
which will use the information under their respective privacy policies.

Opt out at any time by sending email to
privacy@wb.com, by
mail to "Privacy Group, Warner Bros., 4000 Warner Blvd, Burbank, CA 91522," or by
unsubscribing via a link in the email. By submitting my email address, I agree to the
Terms of Service and I acknowledge
that I have read and understand the Privacy Policy.